Initial inline web store install bindings.

chrome/renderer/extensions/extension_helper.h

Index: chrome/renderer/extensions/extension_helper.h
diff --git a/chrome/renderer/extensions/extension_helper.h b/chrome/renderer/extensions/extension_helper.h
index 277b78ba83f3eea67a391148ccad02f25d15ab31..caffc17443cc9b41ba78234624d4cc0f919a3c54 100644
--- a/chrome/renderer/extensions/extension_helper.h
+++ b/chrome/renderer/extensions/extension_helper.h
@@ -26,7 +26,7 @@ namespace webkit_glue {
 class ResourceFetcher;
 }
 
-// Filters extension related messages sent to RenderViews.
+// RenderView-level plumbing for extension features.
 class ExtensionHelper : public RenderViewObserver,
                         public RenderViewObserverTracker<ExtensionHelper> {
  public:
@@ -41,6 +41,8 @@ class ExtensionHelper : public RenderViewObserver,
   bool InstallWebApplicationUsingDefinitionFile(WebKit::WebFrame* frame,
                                                 string16* error);
 
+  void InlineWebstoreInstall(std::string webstore_item_id);
+
   int browser_window_id() const { return browser_window_id_; }
   ViewType::Type view_type() const { return view_type_; }